A chain-driven rotary bar screen

Abstract

This invention discloses a chain-driven rotary bar screen cleaner, comprising: a trough-shaped frame with its opening facing the water-facing side, the frame being inclinedly positioned within a channel; a bar screen unit positioned at the lower end of the frame, the bar screen unit having parallel, equally spaced vertical bars; a drive wheel and a driven wheel respectively positioned at both ends of the frame; a chain drivingly connecting the drive wheel and the driven wheel; a toothed rake mounted on the chain; and a scraping mechanism including a frame with both sides hinged to the inner wall of the frame at one end, a scraper mounted at the other end of the frame, and a stop block positioned on the frame to limit the displacement stroke of the scraper. This chain-driven rotary bar screen cleaner, by tilting the frame, allows the toothed rake to drive the bar screen using the thrust of the water flow, while the scraping mechanism simultaneously cleans the bar screen, reducing bar screen residue on the toothed rake, resulting in a cleaner and more thorough cleaning compared to existing gravity-based bar screen removal methods. Furthermore, the scraping mechanism utilizes gravity for resetting and self-cleaning through vibration during resetting.

Description

Technical Field

[0001] This invention belongs to the technical field of bar screen cleaning machines, and more specifically, relates to a chain rotary bar screen cleaning machine. Background Technology

[0002] Wastewater treatment plants and stormwater / sewage pumping stations should be equipped with bar screens at their inlets to remove floating debris such as vegetation, garbage, and fibrous materials. This is to protect conveying and mixing equipment and reduce the processing load on subsequent processes. Based on the net spacing of the bar spacing, bar screens can be classified as coarse bar screens (25~100mm), medium bar screens (10~25mm), and fine bar screens (1.5~10mm).

[0003] The core of a bar screen is a grid or mesh panel that directly intercepts or filters floating debris in rainwater and sewage. The bar screen can be stationary or rotating. The removal and collection of trapped debris can be done manually, electrically, or hydraulically, sometimes combining hydraulic power and the weight of the debris to achieve separation and collection.

[0004] Chain-driven rotary bar screens are a classic and commonly used type of mechanical bar screen for wastewater treatment plants. They are often used as intermediate screens in wastewater treatment plants and as coarse screens in pumping stations.

[0005] The main pain points in the operation of chain rotary bar screens are: 1. Rapid wear of moving parts; 2. Low slag removal rate, severe siltation and entanglement, and frequent equipment failures. These problems lead to frequent water outages for maintenance, affecting normal production and resulting in high operating costs.

[0006] Currently, the core of technological development both domestically and internationally has shifted from achieving basic functions to improving reliability and optimizing operation and maintenance costs. Summary of the Invention

[0007] The purpose of this invention is to address the shortcomings of existing technologies by providing a chain rotary bar screen cleaner, which solves the problem of low screenings removal rate in existing chain rotary bar screens.

[0008] To achieve the above objectives, the present invention provides a chain rotary bar screen cleaning machine, comprising: The frame is trough-shaped with its opening facing the water-facing side, and the frame is installed at an angle in the channel; A grid unit is disposed at the lower end of the frame, and the grid unit is provided with parallel and equally spaced vertical grid bars; The chain has a drive wheel and a driven wheel at each end of the frame. The chain is connected to the drive wheel and the driven wheel. The chain is equipped with a toothed rake, which cooperates with the grid bars to move the screenings intercepted by the grid bars to the top of the frame. A slag scraping mechanism is provided at the upper end of the frame, which is higher than the channel, and is used to clean the slag on the toothed rake. A drive mechanism is mounted on the frame and connected to the drive wheel; The slag scraping mechanism includes: The frame has two sides at one end that are hinged to the inner wall of the machine frame, and a scraper is provided at the other end of the frame. A stop block, which is disposed on the frame, is used to limit the displacement stroke of the scraper; When the rake approaches the upper end of the frame, the scraper contacts the root of the rake, the rake continues to move and drives the scraper to move synchronously, causing the scraper to move toward the tip of the rake. After the scraper separates from the rake, it returns to its original position due to gravity.

[0009] Optionally, a sealing element is provided between the two sides of the frame and the inner wall of the channel. The sealing element includes a pressure plate and a rubber plate. One end of the pressure plate is connected to the inner side of the frame, and the other end of the pressure plate is bent inward to form an L-shaped bend. One end of the rubber plate is connected to the bend, and the other end of the rubber plate is pressed against the inner wall of the channel by elasticity.

[0010] Optionally, the rack includes: The system has two side walls and a bottom wall. The grid plate unit is disposed on the bottom wall. The side wall near the bottom wall has a mounting groove. The chain is disposed in the mounting groove and has a side plate for sealing the mounting groove.

[0011] Optionally, two chains are provided, and the toothed rake is disposed between the two chains. The chains include: A chain link, comprising an inner chain plate, an outer chain plate, a sleeve, and a pin, wherein the sleeve is disposed between the inner chain plate and the outer chain plate, and the pin is used to connect the sleeve, the inner chain plate, and the outer chain plate. A roller is rolled and fitted onto the sleeve. A guide rail is provided in the mounting groove. The roller rolls in contact with the surface of the guide rail. At least one side of the roller is provided with a rim.

[0012] Optionally, the driven wheel is rotatably connected to the frame via a ceramic bushing.

[0013] Optionally, the drive mechanism includes a geared motor and a drive shaft, one end of which is connected to the geared motor, and the other end of which passes through the frame and is connected to the drive wheel.

[0014] Optionally, a sealing plate is provided on the water-facing side of the upper part of the frame, and a slag discharge trough is provided on the back water side of the upper part of the frame. The outlet of the slag discharge trough is connected to a slag discharge pipeline. An air collection hole is provided on the top of the slag discharge trough, and an observation window is provided near the back water side of the slag discharge trough.

[0015] Optionally, it also includes: A detection module is provided on the drive mechanism or the chain to monitor the operating status of the chain. A control module, connected to the drive mechanism and the detection module, is used to control the operating parameters of the chain.

[0016] Optionally, a channel bottom limiting seat is provided at the bottom of the frame, and a ground connecting seat is provided on the side wall of the frame.

[0017] This invention provides a chain rotary bar screen cleaner, the advantages of which are: This chain-driven rotary bar screen cleaner features an inclined frame, allowing the rakes to utilize the thrust of water flow to reduce resistance in the bar screen cleaning unit. Simultaneously, the scraping mechanism works in conjunction to remove bar screen residue, minimizing residue on the rakes. This results in a cleaner and more thorough cleaning compared to existing gravity-based descaling methods. Furthermore, the scraping mechanism utilizes gravity for resetting, and vibration self-cleaning during resetting prevents bar screen residue buildup. It requires no additional power and operates reliably and stably.

[0018] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0019] The above and other objects, features and advantages of the present invention will become more apparent from the more detailed description of exemplary embodiments of the invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the invention.

[0020] Figure 1 A schematic diagram of a chain rotary bar screen cleaner according to an embodiment of the present invention is shown.

[0021] Figure 2 A schematic diagram of the sludge scraping mechanism of a chain rotary bar screen cleaner according to an embodiment of the present invention is shown.

[0022] Figure 3 A schematic diagram of the slag removal state of the scraping mechanism of a chain rotary bar screen cleaner according to an embodiment of the present invention is shown.

[0023] Figure 4 A schematic diagram of the structure of the grid unit of a chain rotary bar screen cleaner according to an embodiment of the present invention is shown.

[0024] Figure 5 A schematic diagram of the chain structure of a chain rotary bar screen cleaner according to an embodiment of the present invention is shown.

[0025] Figure 6 A schematic diagram of the ground connection seat of a chain rotary bar screen cleaner according to an embodiment of the present invention is shown.

[0026] Explanation of reference numerals in the attached figures: 1. Frame; 2. Grid plate unit; 3. Chain; 4. Toothed rake; 5. Slag scraping mechanism; 6. Guide slope; 7. Seals; 8. Sealing plate; 9. Slag discharge chute; 10. Channel bottom limiting seat; 11. Ground connection seat; 31. Chain link; 32. Roller; 33. Side plate; 51. Scraper; 52. Skateboard. Detailed Implementation

[0027] Preferred embodiments of the invention will now be described in more detail. While preferred embodiments of the invention are described below, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0028] like Figure 1-6 As shown, a chain rotary bar screen cleaner includes: The frame 1 is trough-shaped with its opening facing the water-facing side, and is installed at an angle in the channel; Grid unit 2 is located at the lower end of frame 1 and is provided with parallel and equally spaced vertical grid bars. The chain 3 and the frame 1 are respectively equipped with a drive wheel and a driven wheel at both ends. The chain 3 is connected to the drive wheel and the driven wheel for transmission. The chain 3 is equipped with a toothed rake 4, which cooperates with the grid bar to move the screenings intercepted by the grid bar to the top of the frame 1. The scraping mechanism 5 is located at the upper end of the frame 1, which is higher than the channel. The scraping mechanism 5 is used to clean the screenings on the toothed rake 4. The drive mechanism is mounted on frame 1 and connected to the drive wheel; The slag scraping mechanism 5 includes: The frame has two hinges at one end to the inner wall of the frame 1, and a scraper 51 is provided at the other end of the frame. A stop block is provided on the frame 1 to limit the displacement stroke of the scraper 51; When the rake 4 approaches the upper end of the frame 1, the scraper 51 contacts the root of the rake 4. The rake 4 continues to move and drives the scraper 51 to move synchronously, causing the scraper 51 to move towards the tip of the rake 4. After the scraper 51 separates from the rake 4, it returns to its original position due to gravity.

[0029] Specifically, by tilting the frame 1, the rake 4 can utilize the thrust of the water flow to reduce the resistance of the screen cleaning unit 2 when driving the screenings. Simultaneously, the scraping mechanism 5 assists in cleaning the screenings, reducing the amount of screenings residue on the rake 4. This method is cleaner and more thorough than existing gravity-based screening. Furthermore, the scraping mechanism 5 utilizes gravity for resetting, and during resetting, it employs vibration for self-cleaning, preventing screenings residue residue. It requires no additional power and operates reliably and stably.

[0030] Furthermore, the grid unit 2 is formed by multiple grid bars. The tip of the rake 4 maintains a 5mm gap with the bottom wall of the frame 1, which is smaller than the 15mm gap between the grid bars, to avoid increasing frictional resistance and also to prevent the screenings from falling off. The bottom of the frame 1 is fitted with a guide slope 6 that adapts to the rotation trajectory of the driven wheel and the rake 4, to prevent the screenings from accumulating in the corners of the frame 1.

[0031] In this embodiment, a sealing element 7 is provided between the two sides of the frame 1 and the inner wall of the channel. The sealing element 7 includes a pressure plate and a rubber plate. One end of the pressure plate is connected to the inner side of the frame 1, and the other end of the pressure plate is bent inward to form an L-shaped bend. One end of the rubber plate is connected to the bend, and the other end of the rubber plate is pressed against the inner wall of the channel by elasticity.

[0032] Specifically, the other end of the rubber sheet is pressed against the inner wall of the channel by its elasticity, and adheres to the inner wall of the channel under the action of water force, thus achieving a self-sealing effect. By sealing the gap between the frame 1 and the channel through the rubber sheet, the interception effect of the sewage removal machine is guaranteed.

[0033] In this embodiment, the rack 1 includes: The grid unit 2 is set on the bottom wall with two side walls and a bottom wall. The side wall near the bottom wall has a mounting groove. The chain 3 is set in the mounting groove and has a side plate 33 for sealing the mounting groove.

[0034] Specifically, the mounting groove is sealed by the side plates 33 to prevent debris in the water from getting tangled in the chain 3. The side plates 33 are stacked one end to the other to ensure a good seal.

[0035] In this embodiment, two chains 3 are provided, and the toothed rake 4 is disposed between the two chains 3. The chains 3 include: Link 31 includes an inner link plate, an outer link plate, a sleeve, and a pin. The sleeve is disposed between the inner link plate and the outer link plate, and the pin is used to connect the sleeve, the inner link plate, and the outer link plate. Roller 32 is rolled on the sleeve. A guide rail is provided in the mounting groove. Roller 32 rolls in contact with the surface of the guide rail. At least one side of roller 32 is provided with a rim.

[0036] Specifically, the movement of the chain 3 is ensured by the movement of the roller 32 on the guide rail, while the rolling connection reduces running resistance.

[0037] Furthermore, the roller 32 has a rim on only one side, and the rims of two adjacent rollers 32 are in opposite positions. The rollers 32 are constrained to move on the guide rail by the staggered rims.

[0038] In this embodiment, the driven wheel is rotatably connected to the frame 1 via a ceramic bushing.

[0039] Specifically, ceramic bushings are used to adapt to underwater corrosion and wear conditions.

[0040] In this embodiment, the drive mechanism includes a geared motor and a drive shaft. One end of the drive shaft is connected to the geared motor, and the other end of the drive shaft passes through the frame 1 and is connected to the drive wheel.

[0041] Specifically, the geared motor is mounted on the outside of the frame 1 via a motor mount, and the drive shaft passes through the frame 1 and is connected to the drive wheel.

[0042] Furthermore, to adjust the tension of chain 3, a tensioning wheel can be installed or an outer spherical ball bearing with a slider seat can be used in conjunction with the shaft support to achieve the up-and-down movement adjustment of the drive wheel.

[0043] In this embodiment, a sliding plate 52 is provided at the lower end of the frame. The sliding plate 52 is used to slide with the rake 4 so that the rake 4 separates from the scraper 51 after rotating past the highest point.

[0044] Specifically, the slide plate 52 ensures that the scraper 51 can completely disengage from the rake 4 and separate completely from the rake 4, delays the reset of the scraper 51, avoids the scraper 51 from obstructing the movement of the rake 4, and the slide plate 52 is also adapted to the reverse use of the chain 3 to avoid the scraper 51 interfering with the movement of the rake 4 when the chain reverses.

[0045] Furthermore, to prevent the rake 4 and scraper 51 from jamming, the rake 4 is equipped with a guide ramp, which, in conjunction with the movement of the guide slide plate 52 and scraper 51, causes the frame to flip over to avoid the jamming.

[0046] In this embodiment, a sealing plate 8 is provided on the water-facing side of the upper part of the frame 1, and a slag discharge trough 9 is provided on the back water side of the upper part of the frame 1. The outlet of the slag discharge trough 9 is connected to the slag discharge pipeline. An air collection hole is provided on the top of the slag discharge trough 9, and an observation window is provided near the back water side of the slag discharge trough 9.

[0047] Specifically, the sealing plate 8, in conjunction with the slag discharge trough 9, prevents odor from escaping during slag scraping, thus maintaining environmental safety. The gas collection hole connects to the gas collection pipeline, and the observation window facilitates observation of the slag scraper's operating status. The slag discharge pipeline uniformly discharges the screenings.

[0048] Furthermore, the sealing plate 8 is a transparent sealing plate, making it easy to observe the operating status.

[0049] In this embodiment, it also includes: The detection module is installed on the drive mechanism or chain 3 and is used to monitor the operating status of chain 3. The control module is connected to the drive mechanism and the detection module and is used to control the operating parameters of chain 3.

[0050] Specifically, the detection module monitors the operating status, and the control module adjusts the operating parameters according to different operating conditions. The detection module confirms whether the chain 3 is jammed by monitoring the output torque of the drive mechanism or the operating speed of the chain 3.

[0051] Furthermore, the operating parameters of chain 3 are adjusted according to the water flow velocity and the amount of screenings. When the amount of screenings increases, the operating speed of chain 3 is increased. At the same time, when jamming occurs, the operating resistance of chain 3 increases, and the movement speed approaches zero. This allows chain 3 to be controlled to reverse slightly and then rotate forward again, overcoming the jamming through back-and-forth impact.

[0052] Furthermore, it also includes a liquid level sensor. When the grid plate unit 2 is blocked, the liquid level in the channel rises. The liquid level sensor monitors the changes in liquid level and then controls the operating parameters of the chain 3.

[0053] In this embodiment, a channel bottom limiting seat 10 is provided at the bottom of the frame 1, and a ground connecting seat 11 is provided on the side wall of the frame 1.

[0054] Specifically, the frame 1 is fixed together by the channel bottom limiting seat 10 and the ground connecting seat 11 to ensure the stability of the frame 1. The ground connecting seat 11 is set on the outer side wall of the frame 1 and is used to connect with the top of the channel.

[0055] Furthermore, since the frame 1 is sealed to the inner wall of the channel by a rubber plate, the frame 1 can be directly lifted and pulled out after the bottom limit seat 10 and the ground connection seat 11 are released.

[0056] This embodiment provides a chain rotary bar screen cleaner, taking its operation as an example: The frame 1 is inclined and installed within the channel, with both sides of the frame 1 pressed against the inner wall of the channel via seals 7. Since the grid unit 2 is mounted on the frame 1 and parallel to it, the inclination angle of the frame 1 is also set to 60º~75º to ensure the inclination angle of the grid unit 2 is 60º~75º. A reinforcing bracket can be installed on the backwater side of the grid unit 2 to ensure its stability.

[0057] The chain 3 is equipped with toothed rakes 4 at equal intervals. Driven by the drive mechanism, the rakes 4 are cyclically moved to clean the grid unit 2 in a regular manner, thus cleaning and lifting the screen residue intercepted by the grid unit 2.

[0058] When the rake 4 carrying screenings approaches the top of the frame 1, it first contacts the scraping mechanism 5. During the upward and tumbling process, the scraper 51 peels off the screenings on the rake 4, and then flips and descends. At the same time, the scraper 51 uses self-repositioning after separating from the rake 4.

[0059] During normal operation, the running speed of chain 3 is controlled according to the liquid level. When the liquid level rises due to increased screenings, the circulation speed of chain 3 is increased. When the detection module detects that the rake 4 is stuck with the screening bars, the control module controls chain 3 to reverse for 10-20 seconds, then resumes forward rotation. If forward rotation is normal, operation continues. This method can resolve more than 90% of stuck situations. If the stuck situation persists, the process is repeated up to four times. If the stuck situation still exists after four repetitions, the machine will stop and alarm.

[0060] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A chain-driven rotary bar screen cleaner, characterized in that, include: The frame is trough-shaped with its opening facing the water-facing side, and the frame is installed at an angle in the channel; A grid unit is disposed at the lower end of the frame, and the grid unit is provided with parallel and equally spaced vertical grid bars; The chain has a drive wheel and a driven wheel at each end of the frame. The chain is connected to the drive wheel and the driven wheel. The chain is equipped with a toothed rake, which cooperates with the grid bars to move the screenings intercepted by the grid bars to the top of the frame. A slag scraping mechanism is provided at the upper end of the frame, which is higher than the channel, and is used to clean the slag on the toothed rake. A drive mechanism is mounted on the frame and connected to the drive wheel; The slag scraping mechanism includes: The frame has two sides at one end that are hinged to the inner wall of the machine frame, and a scraper is provided at the other end of the frame. A stop block, which is disposed on the frame, is used to limit the displacement stroke of the scraper; When the rake approaches the upper end of the frame, the scraper contacts the root of the rake, the rake continues to move and drives the scraper to move synchronously, causing the scraper to move toward the tip of the rake. After the scraper separates from the rake, it returns to its original position due to gravity.

2. The chain rotary bar screen cleaner according to claim 1, characterized in that, A sealing element is provided between the two sides of the frame and the inner wall of the channel. The sealing element includes a pressure plate and a rubber plate. One end of the pressure plate is connected to the inner side of the frame, and the other end of the pressure plate is bent inward to form an L-shaped bend. One end of the rubber plate is connected to the bend, and the other end of the rubber plate is pressed against the inner wall of the channel by elasticity.

3. The chain rotary bar screen cleaner according to claim 1, characterized in that, The rack includes: The system has two side walls and a bottom wall. The grid plate unit is disposed on the bottom wall. The side wall near the bottom wall has a mounting groove. The chain is disposed in the mounting groove and has a side plate for sealing the mounting groove.

4. The chain rotary bar screen cleaner according to claim 1, characterized in that, Two chains are provided, and the toothed rake is disposed between the two chains. The chains include: A chain link, comprising an inner chain plate, an outer chain plate, a sleeve, and a pin, wherein the sleeve is disposed between the inner chain plate and the outer chain plate, and the pin is used to connect the sleeve, the inner chain plate, and the outer chain plate. A roller is rolled and fitted onto the sleeve. A guide rail is provided in the mounting groove. The roller rolls in contact with the surface of the guide rail. At least one side of the roller is provided with a rim.

5. The chain rotary bar screen cleaner according to claim 1, characterized in that, The driven wheel is rotatably connected to the frame via a ceramic bushing.

6. The chain rotary bar screen cleaner according to claim 1, characterized in that, The drive mechanism includes a geared motor and a drive shaft. One end of the drive shaft is connected to the geared motor, and the other end of the drive shaft passes through the frame and is connected to the drive wheel.

7. The chain rotary bar screen cleaner according to claim 1, characterized in that, The lower end of the frame is provided with a sliding plate, which is used to slide with the toothed rake so that the toothed rake separates from the scraper after passing the highest point.

8. The chain rotary bar screen cleaner according to claim 1, characterized in that, A sealing plate is provided on the water-facing side of the upper part of the frame, and a slag discharge trough is provided on the back water side of the upper part of the frame. The outlet of the slag discharge trough is connected to the slag discharge pipeline. An air collection hole is provided on the top of the slag discharge trough, and an observation window is provided near the back water side of the slag discharge trough.

9. The chain rotary bar screen cleaner according to claim 1, characterized in that, Also includes: A detection module is provided on the drive mechanism or the chain to monitor the operating status of the chain. A control module, connected to the drive mechanism and the detection module, is used to control the operating parameters of the chain.

10. The chain rotary bar screen cleaner according to claim 1, characterized in that, The bottom of the frame is provided with a channel bottom limiting seat, and the side wall of the frame is provided with a ground connection seat.

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